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FOC | Family List | FOC Vol. 19 | Rubiaceae | Lasianthus

5. Lasianthus biflorus (Blume) M. Gangopadhyay & Chakra­barty, J. Econ. Taxon. Bot. 16: 338. 1992.

石核木 shi he mu

Litosanthes biflora Blume, Catalogus, 22. 1823; Lasianthus gracilis King & Gamble.

Shrubs, 1-2.5 m tall; branchlets terete, densely hirsute to pilosulous. Petiole 0.5-2 mm, hirsute to pilosulous; leaf blade thinly to thickly papery, subrhombic or elliptic-obovate, elliptic, or subovate, 1.5-3 cm × 7-15 mm, glabrous adaxially, hirtellous to pilosulous abaxially, base cuneate, margin flat, often undulate, apex acute, often mucronulate; midrib depressed adaxially, prominent abaxially, hirsute or pilosulous abaxially; lateral veins plane adaxially, prominent abaxially, 6-9 pairs, hirsute or pilosulous abaxially, extending to unite with margin; nervules obscure on both surfaces; stipules ± inconspicuous, narrowly triangular, 0.5-2 mm, densely pilosulous to hirtellous, at apex acute sometimes with 2-4 very small lateral projections or lobes. Inflorescence congested-cymose or with solitary flowers, pedunculate; peduncles 0.5-1.7 cm, sparsely hirsute to pilosulous; bracts inconspicuous, lanceolate to linear, 0.3-1.2 mm. Flowers pedicellate; pedicels 0.2-1 mm. Calyx glabrous to sparsely hirtellous; hypanthium portion campanulate, 1.2-1.5 mm; limb deeply 5-toothed; teeth triangular, ca. 0.5 mm. Corolla 2-4 mm, glabrous outside, villous in throat and on inside of lobes; lobes ovate, shorter than tube, rostriform-incurved at apex. Fruit ovoid or depressed globose, 3-5 mm in diam., glabrous, verrucose, 4-grooved; pyrenes 4.

Forests, shaded and wet places; 600-700 m. Hainan, Taiwan, S Yunnan [Indonesia, Malaysia, Philippines, Thailand, Vietnam].


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